arch/arm/cpu/sa1100/cpu.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Alex Zuepke <azu@sysgo.de>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 /*
  14  * CPU specific code
  15  */
  16
  17 #include <common.h>
  18 #include <command.h>
  19 #include <asm/system.h>
  20 #include <asm/io.h>
  21
  22 static void cache_flush(void);
  23
  24 int cleanup_before_linux (void)
  25 {
  26         /*
  27          * this function is called just before we call linux
  28          * it prepares the processor for linux
  29          *
  30          * just disable everything that can disturb booting linux
  31          */
  32
  33         disable_interrupts ();
  34
  35         /* turn off I-cache */
  36         icache_disable();
  37         dcache_disable();
  38
  39         /* flush I-cache */
  40         cache_flush();
  41
  42         return (0);
  43 }
  44
  45 /* flush I/D-cache */
  46 static void cache_flush (void)
  47 {
  48         unsigned long i = 0;
  49
  50         asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
  51 }
  52
  53 #define RST_BASE 0x90030000
  54 #define RSRR    0x00
  55 #define RCSR    0x04
  56
  57 __attribute__((noreturn)) void reset_cpu(ulong addr __attribute__((unused)))
  58 {
  59         /* repeat endlessly */
  60         while (1) {
  61                 writel(0, RST_BASE + RCSR);
  62                 writel(1, RST_BASE + RSRR);
  63         }
  64 }